Core-shell flame retardant/graphene oxide hybrid：a self-assembly strategy towards reducing fire hazard and improving toughness of polylactic acid
作者：Jing J, Zhang Y*, Fang ZP, Wang DY.
關鍵字：polylactic acid, graphene oxide, self-assembly, flame retardant, toughness
論文來源：期刊
具體來源：Compos. Sci. Technol., 2018.6, 165: 161-167
發表時間：2019年
Here, we report a green and facile method for the synthesis of biobased flame retardant/graphene oxide hybrid (GOH) as a multifunctional flame retardant for polylactic acid (PLA) through organic-solvent-free self-assembly. The electrostatic interactions deposited the polyethylenimine (PEI) and biobased polyelectrolyte (BPE) coating on the surface of ammonium polyphosphate (APP) in water, which gave the negatively charged core-shell flame retardant. Then, GOH was obtained via aqueous self-assembling between the positively charged graphene oxide (pGO), obtained by grafting pristine GO with PEI, and the core-shell flame retardant. Subsequently, GOH was used to enhance flame retardancy and toughness of PLA. The results showed that the GOH endowed PLA with a significant enhancement in both flame retardancy and mechanical properties. Moreover, the designed structure of GOH facilitated the dispersion of graphene sheets and its re-aggregation was impeded even after its melt blending with PLA. Therefore, the biobased flame retardant/graphene oxide hybrid provides a practical possibility for fabricate PLA with toughenness and reduced fire hazards.